Most Common Defects Found in NZ Building Inspections
The most frequently identified defects in New Zealand building inspections. From moisture damage and inadequate subfloor ventilation to weathertightness failures — what inspectors find and how to document them.
What inspectors find most often
After thousands of building inspections across New Zealand, certain defects appear again and again. Understanding the most common findings helps you inspect more efficiently, communicate more clearly with clients, and ensure nothing gets overlooked in your reporting.
This guide covers the defects NZ building inspectors encounter most frequently, what to look for, and how to document them effectively.
1. Moisture and dampness issues
Moisture is the single most common concern in NZ building inspections. New Zealand's climate — wet winters, high humidity, and significant rainfall — creates persistent moisture challenges for buildings of all ages.
Common findings:
- Subfloor dampness from inadequate ventilation or missing ground cover
- Moisture in bathroom walls around showers and baths
- Condensation on windows and interior walls
- Rising damp in older concrete or masonry foundations
- Leaking plumbing behind walls or under floors
What to document: Photograph all evidence of moisture — staining, mould, dampness, condensation. Use a moisture meter and record readings with the location and surface type. Note the conditions at the time of inspection (recent rain, humidity level) for context.
2. Inadequate subfloor ventilation
Poor subfloor ventilation is one of the most frequently identified defects in NZ homes, particularly those built before modern building standards. Enclosed subfloors without adequate ventilation trap moisture, creating conditions for timber decay, mould, and pest damage.
What to look for:
- Blocked or missing subfloor vents
- Insufficient number of vents for the subfloor area
- Ground cover (polythene) missing or damaged
- Standing water or saturated ground
- Timber showing signs of decay or borer activity
What to document: Photograph the subfloor access point, the ground conditions, ventilation openings, and any signs of moisture damage. Note the ground clearance to bearers and whether it meets the recommended 150mm minimum.
3. Weathertightness failures
New Zealand's leaky building crisis made weathertightness a top priority for every building inspection. While the worst of the monolithic cladding failures have been identified, weathertightness issues remain common across buildings of all ages and cladding types.
Common findings:
- Cracked or missing sealants around windows and penetrations
- Failed or missing flashings at junctions (wall-to-roof, wall-to-deck, wall-to-window)
- Cladding damage — cracking, decay, or displacement
- Direct-fixed cladding without a cavity (pre-2005 buildings)
- Deck and balcony waterproofing failures
What to document: Photograph every area of concern with close-up and context shots. Annotate photos to highlight specific defects — cracked sealant lines, missing flashings, staining patterns. For more on weathertightness documentation, see our guide to weathertightness inspections.
4. Roof issues
Roof defects range from minor maintenance items to significant concerns that can lead to water damage throughout the building.
Common findings:
- Aging roof materials approaching end of life
- Rusting on steel roofs — particularly at fixings, valleys, and flashings
- Cracked or broken concrete tiles
- Moss and lichen growth trapping moisture
- Blocked or inadequate guttering
- Failed or deteriorated flashings around penetrations
- Missing or damaged ridge and hip caps
What to document: Photograph the overall roof condition from ground level and any accessible vantage points. Document specific defects with close-up photos. Note the approximate age and material of the roofing and whether it's within its expected lifespan.
5. Drainage and site issues
Poor drainage around a building is a slow-motion problem. Water pooling against foundations, inadequate stormwater disposal, and poor site grading all contribute to moisture issues, foundation movement, and landscaping damage.
Common findings:
- Surface water draining toward the building instead of away
- Missing, blocked, or damaged gutters and downpipes
- Retaining walls without adequate drainage
- Garden beds and soil built up against cladding
- Inadequate stormwater disposal
What to document: Photograph the drainage conditions around the entire building. Note the direction of ground fall, the condition of gutters and downpipes, and any areas where water could pond against the building. If soil levels are above the cladding line, photograph this clearly.
6. Interior cracking
Cracking in interior walls and ceilings is extremely common in NZ homes and ranges from cosmetic to structural in significance.
Common findings:
- Hairline cracks at corners of windows and doors (usually settlement/shrinkage)
- Diagonal cracking indicating potential ground movement
- Ceiling cracks along joist lines (truss uplift or seasonal movement)
- Cracking at wall-ceiling junctions
- Step cracking in masonry or brick veneer
What to document: Photograph all significant cracking with a ruler or reference object for scale. Note the location, direction, and width of cracks. Diagonal or step cracking may warrant a recommendation for structural assessment — document it thoroughly.
7. Electrical concerns
While building inspectors do not test electrical systems (that requires a licensed electrician), visual assessment of the electrical switchboard and visible wiring can identify age-related concerns and potential safety issues.
Common findings:
- Old ceramic fuse boards (pre-circuit breaker)
- Missing or inadequate RCD protection
- Unlabelled circuits
- Exposed or damaged wiring visible in roof spaces or subfloors
- DIY or unprofessional wiring modifications
What to document: Photograph the switchboard showing its age and type. Note whether RCD protection is present. Flag any visible wiring concerns and recommend an electrical inspection by a licensed electrician. Remember — do not touch or test any electrical components.
Documenting defects professionally
The quality of your defect documentation directly affects the value of your report. For every significant finding:
- Take multiple photos — wide shot for context, close-up for detail
- Annotate clearly — use arrows, circles, and labels to make the defect unmistakable
- Describe objectively — state what you observed, not what you think caused it
- Assess significance — is it cosmetic, maintenance, or a significant concern?
- Recommend action — further investigation, repair, monitoring, or specialist assessment
Using InspectPro, you can annotate photos and add findings as you inspect — building a comprehensive, professional report without any office time.
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